cpu upgrade?

I'm trying to upgrade my emachines EL1352G-41W. The video card I bought is beautiful but the cpu I have is mediocre at best. Are cpu upgrades available for my computer? D:
My specs are
Pentium(R) Dual-Core CPU E6600 @ 3.06GHz
AMD Radeon HD 7700 Series
3.1gb of ram
Microsoft Windows 7 Ultimate Edition (build 7600), 64-bit